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Hi,
it,s saying the audio Device used by this Application ( Program )
Is not detected.
The problem most likely is with the program i.e media-Player, Cyberlink Power DVD Et,c.
uninstall and re-install your Audio/Music Application.
Also check the devices/Drivers are not corrupt or not installed.

First check the device manager from the control panel. Check and see if there is a audio device detected and if it is a problem device.If the device has a problem try removing the audio software and then remove the audio device.then re-boot the computer and windows should detect the hardware and begin installing drivers. Make sure you have the updated drivers from Dell downloaded and the updated software. If it does not detect the hardware after re-boot you can try adding hardware manually in the control panel and have it auto detect any new hardware. If these thins do not work the audio card or built in audio may have stopped working. You can buy a basic PCI audio car for fairly cheap to install on your computer if you cannot get the audio to work.

Check your device manager and see if the audio card is detected by the system. Usually if the drivers aren't installed, it will say audio controller with a yellow question mark or a yellow exclamation mark. If not detected, reseat your audio card if possible.

restart the computer so that the o/s can detect the audio device ,if after restarting it didnt work then check the status of your audio driver from the device manager if not detected reinstall if this didnt work then you know the spk is bad and needs replacement

1.) Check Device Manager for any "unknown" drivers, marked with a yellow exclamation point. If you find one that doesn't seem to belong to any of your other devices- you have your onboard. however, you may need to install the drivers for it.

2.) Check your BIOS. Some onboard cards have the ability to be enabled/disabled there.

Other than that, you could be looking at a dead card. All I can suggest if that's the case, to buy a new PCI soundcard to replace it.